火狐浏览器下 如何获得iframe更新的值

Question

IE下面我可以获得 $get("#frame_hidden").onreadystatechange = function () {
                    alert(frames["frame_hidden"].document.getElementById("divMes").innerHTML);
                    if ($get("#frame_hidden").readyState && $get("#frame_hidden").readyState == "complete") {                        var responseText = $get("#frame_hidden").contentDocument.getElementById("divMes").innerHTML;
                        eval("var d=".concat(responseText));
                        if (d.status.toUpperCase() == "Y") {//添加成功时的操作                            var data = "path=" + escape(navPointer);
                            DataLoad(data);                            obj.parentNode.removeChild($get("#upFile"));
                            $get("#btnOpen").style.display = "inline";
                            obj.style.display = "none";
                        } else if (d.status.toUpperCase() == "N") {
                            alert(d.err);
                        }
                    }
                }可是火狐下面却不认识onreadystatechange这个事件！每次都要点击二次才能在火狐里获得iframe的值

Answer 1

 看下这篇文章 http://zhangkejun2012.blog.163.com/blog/static/943535162011115103646304/